Ice accretion simulation on multi-element airfoils using extended Messinger model |
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Authors: | S Özgen M Can?bek |
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Institution: | (1) Turkish Aerospace Industries, Flight Sciences Department, Middle East Technical University Technopolis, 06531 Ankara, Turkey;(2) Department of Aerospace Engineering, Middle East Technical University, 06531 Ankara, Turkey |
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Abstract: | In the current article, the problem of in-flight ice accumulation on multi-element airfoils is studied numerically. The analysis
starts with flow field computation using the Hess-Smith panel method. The second step is the calculation of droplet trajectories
and droplet collection efficiencies. In the next step, convective heat transfer coefficient distributions around the airfoil
elements are calculated using the Integral Boundary-Layer Method. The formulation accounts for the surface roughness due to
ice accretion. The fourth step consists of establishing the thermodynamic balance and computing ice accretion rates using
the Extended Messinger Model. At low temperatures and low liquid water contents, rime ice occurs for which the ice shape is
determined by a simple mass balance. At warmer temperatures and high liquid water contents, glaze ice forms for which the
energy and mass conservation equations are combined to yield a single first order ordinary differential equation, solved numerically.
Predicted ice shapes are compared with experimental shapes reported in the literature and good agreement is observed both
for rime and glaze ice. Ice shapes and masses are also computed for realistic flight scenarios. The results indicate that
the smaller elements in multielement configurations accumulate comparable and often greater amount of ice compared to larger
elements. The results also indicate that the multi-layer approach yields more accurate results compared to the one-layer approach,
especially for glaze ice conditions. |
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